Long term side effect of cetirizine-hydrochloride tablet when dose are irregular?

I m taking cetirizine-hydrochloride tab from 5-6 yr. On an average i m taking this drug 10-12 time in a month when i feel running nose and irriation.Is taking this drug is injurious and what is long term side effect?

In summer i am unable to sleep, my joint are in mild pain, my legs are restless, is this things related to this drug side effect?